The Programmer's Guide to TRSDOS Version 6 - Tim Mann's Home ...

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7.6.22 @DIRWR SVC-88 This SVC will write the system buffer, SBUFF$, back to the disk directory sector that contains the directory entry of the DEC specified in the calling linkage. See the sections on HASH INDEX TABLE and DIRECTORY RECORD FORMAT for additional information. Registers Affected: AF, HL. Entry: B Directory Entry Code of the file. C Logical drive number (0-7). Exit: A Error return code, if any. Z set if no error. 7.6.23 @DIV16 SVC-94 This SVC will perform a division of a 16-bit unsigned integer by an 8-bit unsigned integer. Registers Affected: AF, HL. Entry: HL Should contain the dividend value. C Should contain the divisor value. Exit: HL Returns the resultant value. A Returns the remainder value. 7.6.24 @DIV8 SVC-93 This SVC performs an 8-bit unsigned integer divide. Registers Affected: AF, E. Entry: E Should contain the dividend value. C Should contain the divisor value. Exit: A Returns the resultant value. E Returns the remainder value. 7.6.25 @DODIR SVC-34 This SVC will capture selected directory information for the logical drive referenced in the SVC's invocation and either pass the information to your designated buffer or display formatted information on the *DO device. A function number is passed in register B to control the desired output. Registers Affected: AF. Display Filespecs Entry: B 0; Function to display the directory of visible files to *DO. C The logical drive number (0-7) of the selection. 7-17
Directory to Buffer Entry: B 1; Function to stuff your buffer with directory information. C The logical drive number (0-7) of the selection. HL A pointer to your buffer. The data returned by @DODIR is the first 16-bytes of each directory record followed by the ERN. The buffer will be terminated by an X'FF'. Display Filespecs Matching EXT Entry: B 2; Function to display the directory of visible files to *DO. The display is limited to files matching the given extension. C The logical drive number (0-7) of the selection. HL A pointer to a 3-character file extension. The use of a dollar sign in any position represents a global match. Directory Matching EXT to Buffer Entry: B 3; Function to stuff your buffer with directory information. The data is limited to files matching the given extension. C The logical drive number (0-7) of the selection. HL A pointer to your buffer. This pointer is also interpreted to be a pointer to a 3-character file extension. The use of a dollar sign in any position represents a global match. Note that this function implies that the start of your buffer is stuffed with the file extension to be matched. Obtain Free Space Entry: B 4; Function to stuff your buffer with free space information. The information passed will be DISK NAME and DISK DATE in positions 1-16; total space on the disk (in K) in positions 17-18; and FREE SPACE available (in K) in positions 19-20. C The logical drive number (0-7) of the selection. HL A pointer to your buffer. 7.6.26 @DSP SVC-02 This SVC will output a byte to the video display devspec *DO. Registers Affected: AF, DE. Entry: C Byte to display Exit: Z Set if no error was encountered, otherwise reset (i.e. NZ). A Contains the error code under an NZ condition. 7-18
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MISOSYS, INC. The Programmer's Guid
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1. Introduction Many thousands of u
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language (i.e. BASIC, C, PASCAL, ..
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NAME START END DESCRIPTION LOWCORE
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ackup utility provides exceptional
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3. Device Input/Output Interfacing
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3.2.2 VECTOR Field - This field in
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FILTER *PR USING *S0 the operating
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===================================
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===================================
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ENTRY JR BEGIN ;Branch around linka
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DATA1 EQU $-DATA$ DB 0 ;Data storag
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Offset Contents +0 Contains the las
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image of the serial port UART statu
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called TRACKs. Each track is then d
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The DCT contains the information re
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accessed a single-sided diskette, t
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containing the disk's directory. Th
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Command Purpose RESTORE Recalibrate
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available from Logical Systems, Inc
Page 41 and 42: exceeds this capacity, then it must
Page 43 and 44: is two physical cylinders. Although
Page 45 and 46: 5. The DOS Directory Structure 5.1
Page 47 and 48: ===================================
Page 49 and 50: 5.2.8 PACK NAME - This field conta
Page 51 and 52: The position of a file's hash code
Page 53 and 54: 5.4 THE DIRECTORY RECORD STRUCTURE
Page 55 and 56: Bit 3 Specifies the visibility; if
Page 57 and 58: the first granule in use is the sec
Page 59 and 60: travels the turnpike. In this manne
Page 61 and 62: The @FSPEC SVC will transfer the fi
Page 63 and 64: A high level language permits you t
Page 65 and 66: does exist, @RENAME should return e
Page 67 and 68: Next, it would be very useful if th
Page 69 and 70: LD HL,FCBX+9 ;Point to the LRL fiel
Page 71 and 72: operating system for such a purpose
Page 73 and 74: position where the last character i
Page 75 and 76: ecord. If a file has more than four
Page 77 and 78: DE Contains a pointer to the File C
Page 79 and 80: @RENAM SVC-56 Rename a file on disk
Page 81 and 82: @FNAME SVC-80 Obtain filespec given
Page 83 and 84: @WRSEC SVC-53 Write a disk sector @
Page 85 and 86: 7.6 SUPERVISOR CALL DETAILS 7.6.1 @
Page 87 and 88: Note: @EXIT in SYS1 automatically r
Page 89 and 90: 7.6.10 @CLOSE SVC-60 This SVC will
Page 91: 7.6.18 @DCSTAT SVC-40 This SVC pass
Page 95 and 96: 7.6.31 @FLAGS$ SVC-101 This SVC wil
Page 97 and 98: NFLAG$ This "network" flag is used
Page 99 and 100: 7.6.32 @FNAME SVC-80 This SVC will
Page 101 and 102: 7.6.40 @HEX8 SVC-98 This SVC will c
Page 103 and 104: 7.6.48 @KLTSK SVC-32 This SVC will
Page 105 and 106: 7.6.57 @OPEN SVC-59 This SVC will o
Page 107 and 108: Registers Affected: AF, BC. Entry:
Page 109 and 110: 0-14 FILENAME/EXT:D - left justifie
Page 111 and 112: 7.6.71 @REMOV SVC-57 This SVC will
Page 113 and 114: Entry: DE A pointer to the FCB cont
Page 115 and 116: Exit: A Error return code, if any.
Page 117 and 118: CURSOR CHARACTER Registers Affected
Page 119 and 120: Exit: A Will contain the error code
Page 121 and 122: esident routine into its execution
Page 123 and 124: CKPAWS LD A,@FLAGS$ ;Get Flags poin
Page 125 and 126: ===================================
Page 127 and 128: The TYPE=0A indicates that it is th
Page 129 and 130: Error 08: Device not available A re
Page 131 and 132: Error 28: End of file encountered T
Page 133 and 134: 8.5 HEADER PROTOCOL OF MEMORY MODUL
Page 135 and 136: This is obviously an extremely usel
Page 137 and 138: LD (IX+2),15 JR TASKA By firmly und
Page 139 and 140: 8.7.3 Details of Low Memory Page 2
Page 141 and 142: actual bank switching. As previousl
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set. Thus, the Z-flag will be indic
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8.10 SYSTEM DISK BOOT TRACK The ope
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14 DEBUG 72 PURGE 1B VERIFY 71 DUMP
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8.13 USING @PARAM The @PARAM SuperV
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DW LPARM+1 DB 'FEED ' ;Line feed pa
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;*=*=* PPARM LD BC,0 ;Zero because
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8.14 TRAP Filter Illustrated ;TRAP/
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8.15 SLASH0 Filter Illustrated ;SLA
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8.16 DMP-500 BOLDFACE Filter Illust
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NOMEM$ DB 'High memory is not avail
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@ @ABORT..........7-2, 7-4, 7-8, 7-
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